Egglfing-Obernberg power plant

Egglfing-Obernberg power plant
location
Coordinates	48 ° 19 '7 "  N , 13 ° 19' 12"  E Coordinates: 48 ° 19 '7 "  N , 13 ° 19' 12"  E
country	Germany  Bavaria  Austria  Upper Austria
place	Egglfing am Inn
Waters	Inn
Kilometers of water	km 35.3
power plant
owner	VERBUND Hydro Power GmbH, Innwerk AG
operator	Grenzkraftwerke GmbH
construction time	1941 to 1951
Start of operation	1944
technology
Bottleneck performance	81 megawatts
Standard work capacity	485 million kWh / year
Turbines	6 Kaplan turbines
Generators	6th
Others
Website	Egglfing-Obernberg

The Egglfing-Obernberg power plant is a run-of-river power plant on the lower Inn , operated by Grenzkraftwerke GmbH . VERBUND Hydro Power GmbH and Innwerk AG each own 50% of the power plant . The power plant is located in the municipality of Egglfing am Inn ( Lower Bavaria ) and Obernberg am Inn ( Upper Austria ). The Ering-Frauenstein power plant is located upstream, the Schärding-Neuhaus power plant downstream .

history

The first considerations to use the water power of the Inn to generate electricity go back to 1908. In 1938 Siemens-Schuckertwerke AG presented a master plan that was decisive for further development. The location of the five barrages on the lower Inn, as they were realized during and after the Second World War , basically follows this master plan from 1938.

When the construction of the Ranshofen aluminum smelter began in July 1938, Innwerk AG was commissioned to build the Ering-Frauenstein and Egglfing-Obernberg power plants in accordance with the 1938 framework plan for powering the aluminum plant. Ering-Frauenstein was put into operation in 1942.

In July 1941, construction of the Egglfing-Obernberg power plant began. First of all, an excavation pit for the machine house and two (of the total of five) weir fields were built on the left (Bavarian) bank. After completion, in a second step, a building pit was dug on the right (Austrian) bank for the remaining three weir fields. Due to delays caused by the war, the damming could not begin until July 1944, the first machine then went into operation on October 24, 1944. The second machine went online on January 16, 1946, machines 3 and 4 followed on July 31, 1949 and January 17, 1950. With the commissioning of machines 5 and 6 on May 19 and September 26, 1950 that was The originally planned expansion was achieved, the completion of the power station, switchgear and switchgear took until July 1951.

In 1983, all six turbines were replaced to increase performance. From 1992 new turbine regulators, a new hydraulic system and devices for remote control were installed. The power plant has been vacant since 1998 and is monitored and remotely controlled from Simbach .

construction

The power plant consists of a weir system with five weir fields , a dividing pillar and a power house with six turbines and the six associated generators .

The entire facility was founded on Schlier . The structure is anchored in the Schlier by means of spurs on the upper and lower water side. In addition, sheet pile walls were rammed into the Schlier, reaching up to 8 m below the inlet level and creating a tight connection to the water-impermeable subsoil.

The five weir openings are arranged on the Austrian side of the Inn. Each of the five openings is 23.5 m wide and each of the four intermediate pillars measures 6 m in width, i.e. H. the total width of the weir is 141.5 m. The dividing pillar between the weir field and the power house is 5.30 m wide.

The machine house is more than 110 m long, 16.60 m wide and houses six machine sets. With a total height of around 23 m, it rises on average 14 m above the level of the underwater. It is located on the Bavarian side of the Inn. As a special feature, Egglfing-Obernberg has a rake on the upper water side of the machine house, which none of the other four power plants on the lower Inn has. It was built to protect against floating mines.

Like the other power plants on the lower Inn , the Egglfing-Obernberg barrage does not have a lock . Upstream, the storage space that can be used for energy generation is limited by the Ering-Frauenstein power plant . The approx. 12.7 km long storage space is part of the Unterer Inn nature reserve . On the Bavarian side of the reservoir there is an approximately 10.5 km long dam, on the Austrian side an approximately 7.5 km long dam.

Electrotechnical systems

Electricity is generated by six Kaplan turbines with vertical shaft from the Swiss manufacturer Escher Wyss AG . The originally four-wing, clockwise rotating turbine runners were replaced by five-wing models as part of the increase in performance in 1983. The associated water-cooled generators from Siemens each have an output of 16  MVA . With an average fall height of 10.5 m, all machines together achieve a maximum output of 80.7  MW . The average annual production is 485 million kWh.

In the switchgear , the generator voltage is raised to 110 kV by three transformers - two sets of machines each are combined in a double block circuit - in order to be diverted to Ering , Pocking and the St. Peter substation. The switchgear is on the Bavarian side.

Web links

• Egglfing-Obernberg power plant. RegioWiki for Niederbayern & Altötting, accessed on August 28, 2014 . 

Individual evidence

1. ↑ ^{a b c} Egglfing-Obernberg run-of-river power station. Verbund AG, accessed on August 28, 2014 .  
2. ↑ Österreichische Zeitschrift für Elektrizitätswirtschaft (ÖZE) , 20th year, May 1967, issue 5, p. 166
3. ↑ ^{a b} ÖZE, pp. 170–171
4. ↑ Ering-Frauenstein run-of-river power station. Verbund AG, accessed on August 28, 2014 .  
5. ↑ ^{a b} Egglfing-Obernberg run-of-river power station. History section . Verbund AG, accessed on August 28, 2014 .  
6. ↑ Egglfing-Obernberg run-of-river power station. Construction engineering section . Verbund AG, accessed on August 28, 2014 .  
7. ↑ ^{a b c} Egglfing-Obernberg run-of-river power station. Building description section . Verbund AG, accessed on August 28, 2014 .  
8. ↑ ^{a b} Egglfing-Obernberg run-of-river power station. Technical Description section . Verbund AG, accessed on August 28, 2014 .